How can I add a "new tab" button next to the tabs of a QMdiArea in tabbed view mode?
I know that question is outdated, but some time ago I was looking for ready-to-use implementation of feature you requested. I digged a bit and implement this for Qt 5 -- take a look at repo.
Main idea is to do:
// Create button what must be placed in tabs row
QToolButton *tb = new QToolButton();
tb->setText("+");
// Add empty, not enabled tab to tabWidget
tabWidget->addTab(new QLabel("Add tabs by pressing \"+\""), QString());
tabWidget->setTabEnabled(0, false);
// Add tab button to current tab. Button will be enabled, but tab -- not
tabWidget->tabBar()->setTabButton(0, QTabBar::RightSide, tb);
You will have to write your own class for the QTabBar. The plus button can be added by using absolute positioning.
I have some code here for PySide; it should give you the basic idea.
class TabBarPlus(QtGui.QTabBar):
"""Tab bar that has a plus button floating to the right of the tabs."""
plusClicked = QtCore.Signal()
def __init__(self):
super().__init__()
# Plus Button
self.plusButton = QtGui.QPushButton("+")
self.plusButton.setParent(self)
self.plusButton.setFixedSize(20, 20) # Small Fixed size
self.plusButton.clicked.connect(self.plusClicked.emit)
self.movePlusButton() # Move to the correct location
# end Constructor
def sizeHint(self):
"""Return the size of the TabBar with increased width for the plus button."""
sizeHint = QtGui.QTabBar.sizeHint(self)
width = sizeHint.width()
height = sizeHint.height()
return QtCore.QSize(width+25, height)
# end tabSizeHint
def resizeEvent(self, event):
"""Resize the widget and make sure the plus button is in the correct location."""
super().resizeEvent(event)
self.movePlusButton()
# end resizeEvent
def tabLayoutChange(self):
"""This virtual handler is called whenever the tab layout changes.
If anything changes make sure the plus button is in the correct location.
"""
super().tabLayoutChange()
self.movePlusButton()
# end tabLayoutChange
def movePlusButton(self):
"""Move the plus button to the correct location."""
# Find the width of all of the tabs
size = sum([self.tabRect(i).width() for i in range(self.count())])
# size = 0
# for i in range(self.count()):
# size += self.tabRect(i).width()
# Set the plus button location in a visible area
h = self.geometry().top()
w = self.width()
if size > w: # Show just to the left of the scroll buttons
self.plusButton.move(w-54, h)
else:
self.plusButton.move(size, h)
# end movePlusButton
# end class MyClass
class CustomTabWidget(QtGui.QTabWidget):
"""Tab Widget that that can have new tabs easily added to it."""
def __init__(self):
super().__init__()
# Tab Bar
self.tab = TabBarPlus()
self.setTabBar(self.tab)
# Properties
self.setMovable(True)
self.setTabsClosable(True)
# Signals
self.tab.plusClicked.connect(self.addTab)
self.tab.tabMoved.connect(self.moveTab)
self.tabCloseRequested.connect(self.removeTab)
# end Constructor
# end class CustomTabWidget
Why not make a button out of the last tab of your QTabWidget ? Just create the last tab with a '+' symbol on it and use the currentChanged event.
class Trace_Tabs(QTabWidget):
def __init__(self):
QTabWidget.__init__(self)
self._build_tabs()
def _build_tabs(self):
self.setUpdatesEnabled(True)
self.insertTab(0,QWidget(), "Trace" )
self.insertTab(1,QWidget(),' + ')
self.currentChanged.connect(self._add_trace)
def _add_trace(self, index):
if index == self.count()-1 :
'''last tab was clicked. add tab'''
self.insertTab(index, QWidget(), "Trace %d" %(index+1))
self.setCurrentIndex(index)
if __name__ == '__main__':
app = QApplication([])
tabs = Trace_Tabs()
tabs.show()
app.exec_()